KOSI BAY, SOUTH AFRICA: Necklace of fish traps

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KOSI BAY, SOUTH AFRICA Necklace of fish traps
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Do you see a rabbit or a duck??
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Devils Pitchfork
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The circles appear to rotate when you move your
head closer and further away from the screen
while looking at the dot in the center. Our
peripheral vision interprets the relative
increase or decrease of the image in the retina
as rotational motion of the slanted lines.
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The shade of the center dot is the same in all
the squares. The shade of the background
influences how we perceive it. All squares are
uniformly shaded, but each square seems lighter
on its left edge than on its right edge.
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Apparent movement of the streams is created by
afterimagesas our eyes shift to examine the
picture.
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Which lines are longer?
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Which one seems larger??
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Which one is larger?
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Which circle is larger?